Was his recent performance a one of thing or is he losing his skill?
He’s still a decent player. Pops off during aim duels, thats why he’s so prominent in maps like Breeze. However, he’s not as creative/effective with his util as much as his peers like cNed or Yay. His team doesn’t capitalize on his aim at all, they provide shit support for him to entry leading him to only smoke->dash->updraft.
He is awesome mechanically, but with the jett nerfs he lost a big advantage to his playstile. The game is trending to favouring gamesense, timing and strategy over mechanics. In that scenario he's not as over the rest as he was.
That being said, no one plays well when playing in a team that is trending down.